Honeywell True HEPA air purifiers are the best choice for reducing airborne allergens. In fact, more doctors recommend Honeywell enviracaire air purifiers to their patients than any other brand.v Now you can enjoy the benefits of high efficiency air cleaning without expensive replacement HEPA filter costs. The True HEPA filter removes at least 99.97% of common household particles as small as 0.3 microns from the air passing through it such as dust, pollen, tobacco smoke, mold spores and cat dander. In addition, it helps reduce airborne viruses and bacteria*. The activated carbon pre-filter captures larger airborne particles and helps remove common household odors. QuietCare sound reducing technology provides ultra quiet operation while the air in your room is circulated and filtered several times an hour.+ This air purifier also offers convenient, energy-saving programmable controls which allow you to preset the unit to shut-off when you are away and turn on when you generally use the room, thus minimizing energy costs. A remote control is included for added convenience. The permanent HEPA filter is easy to clean - simply vacuum on average twice a year (depending on use). No more expensive HEPA filters to replace! Also features an electronic filter indicator which reminds you when to clean the HEPA filter and when to replace the carbon pre-filter. This model is most effective for medium size rooms up to 200 square feet.